Drawing-press.



W. KLOGKE. DRAWING PRESS.

APPLIOATION FILED MAY 4,1909.

955,173. Patented Apr. 19, 1910.

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INVENTOR WITNESSES: 'M

W. KLOGKE.

DRAWING PRESS. APPLICATION II LED MAY 4, 1909. 955, 1 73, Patented Apr. 19, 1910.

- 3 SHEETS-SHEET 2.

WITNESSES: fig W W. KLOCKE.

DRAWING PRESS.

APPLICATION FILED MAY 4, 1909.

955,173, Patented Apr. 19, 1910.

s sums-sum s.

INVENTOR WITNESSES:

,- UNITED STATES PATENT. OFFICE;

WILLIAM KLOCKE, OF NEW YORK, N. Y.,

BROOKLYN, NEW YORK, A

ASSIGNOB 'ro E. w. Brass COMPANY, or

CORPORATION OF WEST VIRGINIA.

DRAWING-PRESS.

Specification of Letters Patent.

Patented Aprr19, 1 910.

Application filed May 4, 1909. Serial No. 493,784. r .1

, metal, cutting out, embossing, punching, &c.

It comprises a blank holder which is first pressed down to hold the edge of the sheet, and a plunger which moves through the blank holder to act upon the sheet .after it is held. The plunger is actuated by cranks on a shaft and this shaft in turn operates a toggle mechanism for 'moving the blank holder at appropriate intervals. The plunger-operating shaft is driven by a gear and pinion at one side of the machine. The opposite end of this shaft carries the connections which actuate the toggle mechanlsm. v

The present invention provides improvements in drawing presses and is especiallydirected toward presses of the general character described in said patent, and aims to lessen the strain on the shafts, permitting them to be made much lighter, to obtain an even pressure of the plunger and blank holder upon the work, and to secure other advantages referred to in detail hereinafter.

The accompanying drawings illustrate a machine embodying the invention.

Figure l is a front elevation; Fig. 2 a left hand side elevation, and Fig. 3 a vertical section on the line 3-13 of Fig. 1.

Referring to the embodiment of the invention illustrated, the blank holder, or the carrier upon the lower face of which the blank holder is mounted, is indicated at A. Within it is the plunger B upon the lower face of which the upper die or punch is mounted. The bed C carries the lower die upon which the material is clamped and worked. These parts may be of any usual or suitable construction, and therefore are not illustrated in detail. The blank holder A is guided upon guides D on the side frames E E of the machine, and the plunger B is guided within the blank holder.

The unger is driven from links F F, adjusts. lein length by any usual or suit- I mediate bearing K gr 1 of which the web L is a part.)

able adjusting mechanism vsuch as, is indicated diagrammatically at G. The links are connected at their upper ends to cranks H H upon the lunger actuating shaft J, which is provided with end bearings in the side frames E anaE', and with an inter- L extending across at the top between the side frames. The shaft J is provided at its opposite ends with gears M M which are driven from pinions N N on opposite ends of a cross shaft 0; which cros shaft carries a gear P on itsleft hand end by which it is driven from a pinion Q, mounted on a shaft R extending across the rear of the machine parallel with the shaft '0, and having at its t hand end a gear vS which is driven from a pinion T on the driving shaft U which carries the usual fast-and-loose pulleys V and W at its left hand end.

The end bearings made as long as possible b sions on the outer faces 0 Similar extensions are provided cm the inner faces of the side frames, so as to support the means of exten depending from a web of the crank shaft J are the side frames.

shaft close to the cranks. The lower re;--

movable portions X and Z of each bea are preferably in one piece passing threu the side frame of the machine an fastened to an upper fixed portion Y formed .as an integral lug on the outer face of thesrde frame, which lug .together with the ad acent portion of the frame constitutes the u per part of the complete bearmg. frames E and Eare divided by a horizontal joint adjacent to the upper edge of the parts X and Z and their upper portions are inteconnected through the topr cross-bar hese long endbearings, the rovision-of two cranks H and H with an intermediate bearing for the shaft between them, and the driving of the shaft from both ends, permit an extraordinary lightening of the shaft as compared with that of machines of the previous type, contribute greatly to the durability of the bearings and other parts of the machine in accurate condition, and result in a uniformity of distribution of the pressure not previously attainable. There is pradicaliy no bending strain upon the shaft, a consid-' eration which permits a great reduction in its weight. The twisting strains are duced to a minimum, bein exerted only from each of the gears M to the corresponding crank H or H, so that the intermediate bearing K and the portion of the shaft passing therethrough are subjected to little or no strain. Because of the reduction in weight of the shaft and in twisting and bending strains which the driving mechanism has to exert in addition to its effective work, the power required for any given class of work is materially lessened.

Similar principles are applied to the mechanism for actuating the blank holder. The movement of the latter is effected through links a a Fig. 2, and a pair of similar links, only one of which, a, Fig. 1, is shown in the drawings, said links being connected to the four corners of the blank holder A through any known or suitable individual adjusting devices such as are indicated at 6. These links are operated with a sort of toggle action by cranks upon rock shafts overhead. The front rock shaft 0 actuates the links a and a and the rear rock shaft 0 actuates the opposite links one of which is shown at a The driving and the driven connections are substantially the same for these two rock shafts, and a description of the forward one will serve for both.

The rock shaft 0 is supported in end bearings d d and provided with cranks e e closely adjacent to the bearings and connected to the driven links a a and is driven from both ends, so that,the intermediate portion of the shaft is subjected to no twisting strain and but little or no bending strain, and can be made of extreme lightness. It can thus be made of considerable length for presses of large size and without the necessity of an intermediate bearing.

The rock shaft 0. is driven by means of arms f f at its opposite ends and close to the side frames of the machine, these arms being connected by links 9 g to slides h h which reciprocate vertically. As the slides h h approach their upper ends, the links 9 g approach a horizontal position. WVhen the links 9 g are approximately horizontal and the arms f f and cranks e e are approximately vertical, the blank holder is pressed to its final position. During the slight subsequent upward movement of the, slides, there is only sufficient movement of the toggles to lock them firmly, and the up ward reaction is taken entirely by the bearings without substantial strain on the shaft operating mechanism. The driving links g g and the driven links a a and the crank arms, are arranged at such angles as to work practically as toggles at the ends of their strokes. This arrangement, and the rovision of drivin means at both ends of the rock shaft, enab e the latter to be actuated with a minimum amount of power, and to be held with perfect firmness in position for locking down the blank holder.

7 ating shaft an The slides h it are driven from the plunger-actuating shaft or gears, and are located at opposite ends of the shaft so as to distribute the load evenly and symmetrically. These slides are guided at their upper and lower ends upon guideways j k embraced by flanges Z and m respectively at the upper and lower ends of the slides, and formed on the upper projecting rib Y, and a similar lower projectin rib n. The slides h h are located between t e gears M M and the corresponding side frames and are driven therefrom by means of links 0 connected at their upper ends to crank pins 2) upon the outer faces of the gears, and at their lower ends to pins g upon bosses r constituting extensions of the lower portions of the slides. This arrangement of the connecting mechanism between the plunger actuating gears and the rock shafts, not only balances perfectly the strains at opposite ends of the plunger actuating shaft, but provides supports which are close to themain frame of the machine and to the ends of the rock shafts, so as to be comparatively unyielding and to remain true in spite of long and hard usage, and also keeps down the power required for driving the machine.

l/Vhat I claim is 1. A drawing press havin a blank holder, a rotary sha t plunger, a pair of rock shafts blank holder, and mechanism at each end of said plunger-actuating shaft for transmitting the motion thereof to each end of each of said rock shafts.

2. A drawing press havin a blank holder, a rotary sha t pliinger, a pair of rock shafts actuating said blank holder, and mechanism at each end of said plunger-actuating shaft for transmitting the motion thereof to each end of each a plunger and actuating said actuating said a plunger and actuating said of said rock shafts, and gearing at each end of said plunger-actuating shaft for driving it with equal pressure at each end.

3. A drawing press havinga lunger-actuating shaft, a drlvin car at t e end thereof, and a blank-ho driven from said gear, located between said gear and the side frame of the machine and guided upon the side frame of the machine.

4:. A drawin press having a lunger-actu- (T driving gears M at opposite ends thereof, and blank-holder-actuatin slides h h driven from said gears, locate between said gears and the side frames of the machine, and guided upon the side frames of the machine.

5. A drawing press having a lunger, a shaft J, cranks H H- on said s aft, links F F between said cranks and opposite portions of the plun er, end bearings for the shaft located close y adjacent to said cranks, gears M M upon the opposite ends of said shaft, a shaft 0 carrying pinions N N ener-actuating slide it gagin the respective gears M M whereby said s aft is driven wlth equal .force at its opposite ends, and the strain is evenly distributed upon the plunger and at opposite parts rock shafts for actuating it, and links transmitting the motion of said rock shafts to opposite ortions of the blank holder, said rock sha ts also being-driven with equal force at their opposite ends. 6. A drawing press having a plunger, a shaft J cranks H H on said shaft, links F F between said cranks and oppositeportions of the plunger, end bearings for the shaft located closely adjacent to said cranks, gears M M u on the opposite ends of said shaft, and a s aft 0 carrying pinions N N engaging the respective gears MiM, whereby said shaft is driven with equal force at its opposite ends and the strain is evenlydistributed upon the plunger and at opposite parts of the shaft, a blank holder, a pair of rock shafts c 0' for actuating the same, and means for transmitting the motion of said gears M and M to said rock shafts, said transmittin means being located at opposite sides 0 the machine so as to ositively actuate the opposite ends of eac of the shafts 0 c from the gear at the correspondof the shaft, a blank holder, a pair of ing side of the machine, so as to maintain a uniform load upon said gears and to exert a uniform strain upon said rockshafts.

.7. A drawing press having a plunger, a shaft J, cranks H H onsald shaft, links F 'F' between cranks and opposite portions of the lunger, bearings for the shaft located close y" adjacent to said cranks, gears M M upon the opposite ends of-said shaft, and a shaft 0 carryin%4p1 'ons N. engaging the respective gears M, whereby said shaft is driven 'with equal force at its op osite ends and the strain is evenly distri uted upon the plunger and at opposite parts of the shaft, a blank holder A, a pair of rock shafts c, 0, for actuating it, links transmitting the motion of said rock shafts to opposite portions of the blank holder, and means for transmit-ting the motion of the gears M M" to both ends of each-of said rock shafts so as to drive them with equal force at opposite ends.- y

In witness whereof, I- have hereunto signed my name in the presence of two subscribing witnesses. I

'WILLIAM KLOCKE. Witnesses:

D. ANTHONY USINA, FRED WHITE. 

